Exporting cloth simulation to Collada results in static cloth instead of a waving one
A collada file supports a static mesh, while an armature may be included to deform the mesh using some animation data. For a mesh deformed from a simulation, you need to use a file that supports an animated mesh, that is, different mesh data is used for each frame.

This can be done in files such as Newtek .mdd, a .pc2 pointcache file or an alembic .abc file. Both mdd and pc2 can be exported using addons available in the standard blender release that just need to be enabled. Alembic should be available in release builds, but as alembic support is compiled into blender, if it isn't available you will need to find a different copy of blender that has it included. Blender can use this exported data in the Mesh Cache Modifier for mdd and pc2 or the Mesh Sequence Cache Modifier for alembic.